Basic Qualification · B-003 Station assembly, practice and safety · B-003-002-006
Dans un émetteur FM, quel étage produit un harmonique utile?
- ALe multiplicateur de fréquence
- BLe modulateur
- CL'amplificateur de puissance
- DL'amplificateur microphonique
Correct answer: A — Le multiplicateur de fréquence. Question tirée de la banque officielle d'ISDE.
Why
A frequency multiplier is designed specifically to take an input signal and output a signal at a whole-number multiple of that frequency, creating useful harmonics to reach higher operating bands. The full explanation — and one for every question — is in Pro.
Practise this section
Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.
Drill B-003 — free, no account